util: add coverage for util.inspect.colors alias setter
Add test to confirm that the setter for aliases in util.inspect.colors
keeps the alias reference-equal to the target value.
Refs: https://coverage.nodejs.org/coverage-5b0308cd823a5110/lib/internal/util/inspect.js.html#L357 Refs: https://codecov.io/gh/nodejs/node/src/5b0308cd823a511098dadf9ddd5a35e3a9dbb424/lib/internal/util/inspect.js#L357
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines